Tracer controlled mechanism



April l0, i945.

a. c. K. sALlsBuRY 'TRACER CONTROLLED MEC-IANISM 10 Sheets-Sheet l Filed April 19,- 1940 GNN um@ mNN hmm bmw www m6 .www vom mmm.

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TRACER CONTROLLED MECHANISM Filed April 19, 1940 10 Sheets-Sheet 2 April l0, 1945;

C. K SALISBURY TRACER CONTROLLED MECHANISM Filed April 19, 1940 10 Sheets-Sheet 4 hdm..

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April l0, 1945'.` 'c K. sALlsBUYRY A 2,373,265

TRACER CONTROLLED MECHANISM A Filed April 19 1940 l0 Sheets-Sheet 5 April l0, 1945.

Filed April 19, 1940 1o sheets-sneer 6 .eze 659 www 820,

(-I' lflp'dl 830 629 /7/ 3/ 7 f 840 A@M625t Patented Apr. 10, 19.45

UNITED STATES PATENT OFFICE TRACER ooN'rnoLLEn Mechanism charles x. Salisbury, waterloo, Iowa Appiicuiionnprii i9, 1940, serial No. 330,525

' (ci. :i2- 14) 38 Claims.

My invention relates to tracer controlled mechanism The' objects of my invention are; to provideV positive clutch engagement at the point of motion reverse and to maintain the engagement until the motion` is completed, to provide means to vary the extent of the reciprocated movement .to vary rotative speed, to provide remote control mechanism for varying the reciprocating movement, to provide means whereby the reciprocating movement is automatically varied by movement of the tracer mechanism, to provide means whereby a balance of moving parts is automatically maintained forv varying reciprocating movements, to provide means to give quick response of the clutch to pattern variation, to provide a clutch in which the same driving member is adapted to engage in either direction, to provide a counterbalance for the driving members and their positioning mechanism that will pre- `vent improper engagement of a driving member in Figure 3 and sectioned on une 4-4 oi Figure 3.

Figure 5 is a cross section of theclutch mechavnism taken on line 5-5 of Figure 4.

Figure 6 is a cross section of the roller clutch assembly taken on line 68`of Figure 5.

Figure 7 is 'a longitudinal section of the variable- Figure 9 is e iongitudinai'seotion of the veriable stroke crank shaft and its counterbalance taken on line 9-9 of Figure 4.

Figure 10 is a side view of one set of the clutch control magnets sectioned on line iiiiii of Figure 3.

means for varying the position o! the` tracer point to provide automatic tracer resetting and reversal Figure 11 is a view of the spindle rotation controlled feed stop.

Figure 12 is a plan view'of the tracer. I

Figure 16 shows the tracer with a greater de-l. flection of the point than shown in Figure 15, to

give out-feed and longitudinal feed.

Figure 17 shows a further deflection' of the point than shown in Figure 16, with the out-feed operative but thelongitudinal feed inoperative.

Figure 18 is a cross-'sectional view of the tracer bar taken on line l8-I8 of Figure 13.

with the' 've and other objects inview, my

Figure a is e pian view of the clutch operai-.-

ing und controlling mechanism vwith its protectivecover removedl and 'sectioned on line 3-3 of Flgurei. y

Figure 4 is an end view 'of the mechanism shown Figure" 19 is a view of the inertia counterba ance in its deflected position.

Figure 20 is a plan view of the hook-up mechanism to operate the yclutch by power, sectioned. on line 20-20 of Figure 4.

Figure 21'is e side view oi the veriebiy-set.

crank throw limit switch and its indicator.

Figure 22 is a Figure 21.v

Figure 23 is aplan view of the non-variable limit switch co-operating with Amanual operation by remote control.

Figure 24' is a cross-sectional view taken on line '2l-24 of Figure 1, showing the cross feed operating mechanism and the Atracer in position for making a roughing cut.

Figure25 is a view taken on line 25-2l ot plan view of the switch shown in changecontrol coils and co-operating mecha-v nism, sectioned through the coil on line 29--29 of Figure 3. i

Figure 30 is a diagram of the electric connections.

Figure 31 is a sectional view of an alternate form of variable throw crankshaft where both clutch members are reciprocated bya single crankshaft.

Figure 32 is an end view of an alternate form of clutch plate.

.It will be noted that to show a complete operable mechanism, the lathe has been chosen for illustration. It is understood that any mechanism controlled in its operation by a tracer guided by a pattern is included in the invention.

A lathe having a bed 35, Figures 1 and 2, is provided with a power rotated spindle 36 which is adapted to carry a work piece 31.

A carriage 38 slides on the bed and carries a cross slide`39 `which is provided with a compound rest 40 on which is secured a cutting tool 4| to operate on the work. Two brackets 43 and 44,- Figures 1 and 2, are secured to the rear of the lathe bed. These brackets carry a pattern support which is machined in planes parallel with the lathe center.

A tracer controlling pattern 48. is removably attached to the pattern support.

'I'he carriage is moved in either direction by a lead screw 41 or by a feed rod 48 (Figure 2),'as most convenient.

The cross slide is moved in either direction by a cross feed screw 49 which has its outer end supported in bearings in a bracket 5| rigidly secured to the carriage by bolts 521 (Figures 24 and 25).

'I'he end of the cross feed screw carries a slidable gear pinion 53 which is provided with a driving key 55 (Figures 24 and 25) engaging a slot 56 in the screw.

The pinion 53 may-he moved to engage for drive Lby'a gear 51 integral with a miter gear 58 and A crank shaft 80, Figures i, 2, 3, 4, 7, 8 and 9, is supported by ball bearings 8| (Figures 3 and 4) to the clutch case and serves to operate the clutch shaft 12.

'This crank shaft carries a gear 82 (Figures 1, 2, Sand 4) which meshes with a like gear 82a for drive by a second crank shaft 80a which carries this gear and is supported vby ball bearings 8|a to the clutch'case.

AThe crank shaft 80a operates the clutch shaft 12a .and is provided with van extended end 83 (Figures 1, 2 and 3) which carries a pulley 84 driven by a belt 85 from a pulley 86 on a motor 81 (Figures 1 and 2). The motor is secured to a swinging bracket 88 which is pivoted at 1| to the bottom of the clutch case (Figure 2) It will be noted that the clutch shaft 12 and the crank shaft 80, with associated parts, comprise a unit controlling the cross slide.- The by a. key es (Figures-24 and 25). This shaft-is supported in bearings 66 in the brackets 43, and 44 and has a gear 61 (Figures 1 and 2) secured to its end to mesh with an idler gear 69 carried by ported in bearings 13 (Figures 3,4 and 5) in a' clutch shaft 12a and the crank shaft 80a form an identical unit to control the carriage.

The corresponding parts in the separate units therefore carry the same reference number with the addition of the letter a for all parts of the unit controlling the carriage. The description of, or reference to, any part in one unit will b e understood to apply to the'like part in the other unless special reference is required.

A protective cover 19, Figures 1 and 2, which should also be adapted to reduce sound effects, is secured to 'the clutch caseby means of screws 50.

A driven clutch member 89, Figures 1, 3, 4, 5 and 6, of rigid but light construction, is secured to rotate the clutch shaft 12. It has a. cylindrical bore 90 (Figures 5 and 6) which is hardened and ground true with the shaft. Two clutch rollers 9i (Figures 5 and 6), of hardened and ground material, are placed in position between the bore and hardened clutch plates 93 which are ground nat on their contact face. The clutch plates are rigidly clamped in dove-tailed slots in a clutch head 94 by two clamp plates 95 which are held in position by bolts 96 (Figure 6). The clutch plates are adjusted in their setting to permitof' a clearance of approximately four one-thousandths of an inch between the roller and the bore at the 50' The clutch head is provided with a tapered bore and is rigidly xed by a nut 98 (Figure 5) and a key identical with that shown at 99a in Figure 3 to one end of an oscillating sleeve |00 (Figures 3 and 5) which has a close bearing t on' the clutch shaft 12.

A cage |03, Figures' 5 and 6, of very light but rigid construction, is fitted to the sleeve for slight oscillating movement thereon.

.At points opposite to eachother, the cage has Extending through a reinforced opening |05 (Figures 3,' 5 and 6) at 90 degrees relative to the ears, is a driving projection |01 of an inertia counterbala'ncing lever |09, Figures 3 and 5. This lever is solidly riveted to the projection i|0 of a clutch case 14 secured to the end of the lathe bed end to mesh with a'gear 11 secured to the lead screw 41 (Figure 1).

transfer yoke H2 and is also riveted to a second projection I3 of the yoke with a spring arm |I4.

The yoke has a -swinging connection to the oscillating sleeve through pivot pins H6 which screw through the yoke and have bearings in the sleeve diametrically opposite to each other. They are securely locked in position in the yoke by jam nuts ||l.

'I'he lever |09 is of the same spring material as that of the spring arm I4 and has its end ppo-' site to the projection |01 formed to engage a projection H9 riveted to an inertiacounterbalance |20. This also has. a slight oscillating movement on the sleeve and is-moved in a direction opposite to the cage by the lever connection.. A collar |2| The crank shaft 80 is provided with a .crank head |24, Figures 3, 4, 7, 8 and 9,-which is formed integral with the shaft for rigid construction.

The head is cross-drilled-at |28 at one side of the bearing center ofthe shaft. It is also cross'- drilled at |29 in line with the drilling |26 (Figures 3, 4, 7 and 9). A star gear wheel |30 has its integral shaft inserted in the drilling |28 in which it is rotatably held by a locked nut 3| (Figure 9).

A crank throw adjusting screw shaft |33 extends through the drilling |29 and has an enlarged threaded end |32 adapted for crank adjustment (Figure 9).

The adjusting screw is held lirits rotatable position by a gear wheel |35 which meshes withthe star wheel |30. The gear wheel is secured to the shaft |33 by screw threads and by a key |36 (Figure 9) and then locked by a nut |31.

The-threaded operating enof the adjusting screw -cooperates with an` adjusting nut |38 which may slide in a slot |48 (Figures 4, 8 and balance support' for bearing at a point equal to 180 degrees relative to the pivot pin |45 (Figure 8). f

A counterbalancing lever |59 (Figures '1, 8 and 9) has its bearings on the crank shaft and has an arm |58 which closely engages in a slot |60 cut lengthwise in the crank throw member diametrically opposite to its pivot pin |45. At a point equal to 18|)4 degrees relative to the arm |58, the counterbalancing lever has a second arm |61 (Figures '1 and 8) which engages in an incline slot |6| in the counterbalance opposite 9) cut lengthwise in the crank `head in line with pivot pin by the mechanism above described. by Y rotative movement -of the star wheel to adjust the crank thro'w.v Aspring actuated ball de.v

tent '|49 (Figures-3 and4) positions the star wheeli The crankthrow member ened 'and ground bearing cones, |50 which support a seriesof -hardenedballs |5| in a hardened and ground racel52 of a connecting rod |53.A Ihe` free end of the rod isconnected to a. downward extending-'arm y|23 of the oscillatingcarries hardsleeve by a1bo1t, |25 which passes through the connecting rodl land through a bearing sleeve |26. This bearing sleeve is clamped endwise to the'connecting rod by a. nutA |21 to `provide a rigid Ibearing pin (Figure 5').

The cones |50 are rigidly clamped to the crank throw'member by a nut- |54 which is locked by a spring wirekey |55. l I

A counterbalance `support |06 is secured to `the crank shaftby a key ||5 and alocking setscrew ||8as showninFigure 3. A crank throw coimterbalance |56 has its integral pivotv pin |51 yextend through the coimterto its pvot pin |51.

The lever |59 has two incline faced slots, |68 (Figure '1) which are opposite to each other. These engage the end of incline faced projections |64 of an indicator collar |65. This collar is free to slide lengthwise on the crank shaft but is prevented from rotating by the projections contacting the side of slots |66 (Figure '1) in the counterbalance support in which they slide.' v

Ay heavy spring |68 (Figures 3 and '1) acts to return the collar. This spring has its base support on an eccentric bushing |18 (Figure 3). This bushing is held to rotatewith the crank shaft by`a retaining washer |1|, a spacer |12, a. bearing cone |13, and a nut |14 on thereduced end of the crank shaft. A jam nut |15 locks the parts together.

A bearing sleeve |16 on a connecting rod |11 (Figures 3, 4 and 5) has its bearings on the eccentric bushing for reciprocating motion. The opposite .end of the connecting rod |11 is connected to a swinging lever |18 by .a bearing pin |19 carried by the lever near its center.

.The lower end of the swinging lever is secured to-one end of a sleeve |8| 'which oscillates on a shaft |82 whichis supported in bearing projections on the clutch case base.

The upper end of the lever |18 is expanded to form a carrier head |83, Figures 3, 4, 5 and 20, having side walls |84 (Figures 4, 5 and 20) which-are drilled crosswise for a pin |85 on whichis pivoted Thev lower ends of the levers are swung outward by light leaf springs which are se cured at their upper ends to the carrier head by stop' rivets |9| which serve to limit the movement of the levers.

The Alever |88 is provided with a short arm |92 .extending upward for control contact, while the lever |89 has a longer control arm |93 also extending'upward but widely separated from .the

two hook-up levers |88 and.

spring pressure and are closely supported :but`

freely movable in the carrier head. I

Either of the hook-up levers may contact -for '-reciprocated drive, in opposite directions, with theend ofv an arni which has'its opposite ena bent downward andl provided wana swt |91 (Figures 5 and 20) to provide a rocking seat on an upward extending arm |98 of a lever |99'.

A bolt- 200 passes through themand through a tensionspring 20| to provide a flexible connection controlled by an-adjusting nut 202. 'l

The lever |99 is rigidly secured to the upper end of ai, sleeve 204, Figures 4 and 5, which may oscillateon a pivot bolt 205 adjustably secured by a threaded connection .to an elevation -201 of the clutch case.

The lever |98 is 4provided with a pin 288, Figures 3, 4, and 5, which serves as a bearing pivot for a slide block 2|l fitted for close sliding movement in'a semi-circular slot 2|3 in the yoke H2. This slot is long venough to permit of the oscillating movement of the clutch sleeve.

The carrier head is shown by full lines in Figure 20 at one limit of its reciprocated movement. The arm |55a is likewise shown in the position it takes when the clutch rollers are held in their central inoperative position through co-operation of the spring arms |08 and I I4 and the inertia counterbalance |20.

To more exactly return the clutch rollers to their inoperative position, a stili detent spring 2I5 is provided. It is rigidly secured to the lower end of the sleeve 204 and its formed end 2li is held, by a retaining nut 2|1 on the pivot bolt, in centering spring contact with a notch 2|8 in the upturned end of a detent plate 22D. The plate is located on the pivot bolt and is locked by a nut 222 to the clutch case base in securing the pivot bolt. A screw 224 (Figure in a slotted hole 225 in the detent plate, permits securing 4in The levers |88 and |89 are slightly recessed at their contact points |84 and also hardened. Upon movement of the carrier head to near its opposite limit of movement, as indicated by light dash and dot lines (Figure 20), the lever`|88 win be swung to its iight Vii-isn and dot position4 and the clutch rollers will be forced into driving contact. Any further movement of the carrier head toward its limit of movement will rock the armo'n its seat by yielding of the spring 20| and `the driving pressure on the clutch rollers will be maintained for a considerable time during the return movement of the carrier head, due to the spring 28 If the hook-up lever |88 swings to operating position, the am lss win-be carried to the position shown by the heavy dash and dot lines 221 to force the clutch rollers into operating position for drive in the opposite direction.

It will b e noted that whenone of the hook-up levers iszin operating position, the other is restrained by the -end of the arm |85 from also taking that position even though both controlling-.coils are energized. The first 'one must be -and 288 on which the armature is plvoted by a pin 288.` The side plate Y288 also supports an adjustable tension spring 24| which has one end xed 'to the amature for retraction. It also supports an adjustable stop screw 24| to limitthe armature movement.

n Thevspring 248 provides the retractive ,force to swing the hook-up lever |88 out of engagement with the arm |95 through pressure on the arm |88. To permit rapid action by small electric power,

the armature and its extended end are made as light as possible. A The counteracting springs should also be kept as light as possible.

A very, thin non-magnetic shield 248 (Figure 3) is placed between the core and the armature to prevent the armature sticking.

The arm |92 of the hook-up lever |88 engages with an extended end 245 of an armature 248, Figures 4 and 10, to provide for retraction of the hook-up lever. The armature is pivoted on the pin 238 and is operated by a coil 241 (Figures 4 and l0) which is supported by a laminated core 249 and bcore side plates '250 and 25| (Figure 10). The side plate 250 carries an adjustable retraction spring 252 and' also an adjustable stop screw 253.

The coil 241 and its core 248 are identical with the coil 232 and its core and is assembled therewith and directly below by bolts 255 (Figure 10) and spacers 256 to form a control unit. This unit is secured by bolts 25.8 to a base strip 2 (Figures 3, 4 and l0) which is locked to the top of a post 25| (Figures 3 and 4) which' has its lower end secured to the base-of the clutch case.

The coil unitcom'prising coils 282e and 241a and associated mechanism, is also suported by the base strip 269. This unit controls the action of the hook-up levers |8811 and |88a.

The extended ends of the armatures must be` of correct length to maintain control contact with their hook-up levers at all points of the reciprocated movement of the carrier heads.

The star wheel |30, due to being offset relative to -the center of the crank shaft, may make operative contact with the edge of a star wheel bearing sleeve 21| (Figure 29) which rocks on a shaft 212 supported by a bearing projection 21 on the base for end support. l

'I'he shifter arm isA held out of engagement with the star wheel by a spring 214 (Figure 4) which has one end fixed to an arm 215 (Figures 4 and 29) at Vthe lower end of the shifter arm and its other end xed to a like arm 218 (Figure 3) of a second shifter arm 218 which is secured to l sleeve 288 and rocks on a shaft 28| secured in bearing projections 288 ofthe base of the clutch case.

, The shifter arms218 and 218 are bent'at an angle relativeto`their sleeves to present a spiral driving edge to the star wheel to rotate it, when engaged, the distance of one tooth foreach revoution of the crank shaft, but in opposite directions.

The shifter arm 218 is moved into engagement by 'a connecting lever 285, Figures 3, 4r and 29,

which is pivoted at its lower end to a bearing projection 281 (Figures 3 and29) on' the base.

The lower end olthis lever has an arm 288 (Figure 29) to lcompress a spring 288 supported in a depression 28| in the base to return the lever to its inoperative. position. It alsohas an arm 282 whici contacts the base to limit the return movemen The upper end of the lever 285 is linked by a pin 284 (Figure 29) to -the outer end of a laminatedplunger 285 which'is adaptedto bcclccttlf cally drawn into a coil 296. 'I'his coil has a nonmagnetic bushing 291 in which the plunger slides and which aids in supporting the coil in a laminated magnet frame 298 by means of side plates 300 and 30| which are secured to the frame by screws 303. v

The side plate 300 is provided with a recess 304 'to provide clearance for the pin 294 when the lever 285 is in its retracted position.

The coil is supported bymeans of a common coil support 306 to which the laminated frame 298 is secured by screws 301 as shown in Figures 3, 4 and 29. The coil support is secured to the upper ends of two posts 368 .and 309 which have their lower ends secured in the clutch case base.

lar as shown at 342 in Figures 21 and 22, and is secured to the lever plate to swing therewith.

An insulating plate 343 is secured to the lever plate and carries, insulated therefrom, a contact plate 345.

The plate 345 is provided with spring contact arms 346 and 341 extending downward and electrically connected to a soldering lug 346 (Figures 21 and 22).

The contact arm346 contacts with the edge of a semi-circulary contact plate 350 (Figures 21y and 22) carried by an insulating plate 35| secured to a swinging lever 353- which has its bearings on the sleeve 334. The lever has an arm 355 The coil support, is provided with a projection 3|0 against which the lever 285 slides for side support.

' At the height of the crank shaft, the lever 285 is provided with a cam projection 3|2 adapted to contact with'a'likeprojection 3|3 on the shifter arm 210 and move it into operative contact with the star wheel when the coil is energized. The parts then take the same position as shown for the shifter arm 210a in Figures 3 and 4 where the shifter arm 210a is in operative position; In this position, the shifter arm is locked against side thrust by its cam projection contacting with a flattened surface 3|4 on the lever 285 as shown in Figures 3 and 29.

The shifter arm 219 is moved into operative contact with-the star wheel |30 to rotate it -ln the direction opposite to that produced by the shifter arm 210, by a connecting lever 3|1 which is provided with a cam projection 3|6 adapted to contact alike projection 3 I 9 on' the shifter arm.

The lever 3I1 is pivoted at its lowerend to the clutch case base and linked at its upper end to the end of a plunger'32i in the manner described for the lever 265.

The plunger 32| is operated by a coil 323. carried by a laminated magnetic frame 324 and secured to the coil support 306, by screws 326, in the manner previously described.

The coil 296a which operates the shifter arm 210a for rotation of the star wheel |30a, and the like coil 323a which operates the shifter arm 219a to rotate it in the opposite direction, are secured to the coil support 306 in the order shown in Figure 4.

The coils 296 and 323 may be controlled by a toggle switch 330 carried on the lathe apron 42, Figure 1, or they may be automatically controlled by' means later described. vIn either case; the limit of rotation of the star wheel |30, in'either direction, is determined by mechanism here de.- scribed. y

A vertical bearing sleeve 334 has its lower end secured in the clutch case base at one side of the center line of the crank shaft 12 as shown in Figures 4 and 21,

and carries a lever plate 331 on its upper end secured thereto. The lever plate bears on the upper end of the sleeve and, at a point directly be'- low the crank shaft, is provided with a vertical pin 336 fitting between 'flanges 339 of the indicator collar |65. The endwise movement of the inditcator collar through action of the star wheel swings the lever plate'and asscciated parts on its .bearings in the sleeve, Figures 21 and 22.

Directly above and in line with the shaft 335 isV an indicator shaft 34|, Figures 1, 2, 3, 4, 21 and 22. This shaft has a portion of its lower end curved sidewise to clear the flanges of the indicator collever to securely hold extending to one side and provided with an elongated opening 356 (Figure 22) through which an end 351 of a downward extending arm 358 protrudes. This arm is secured to the lower end-of a sleeve 36 (Figure 21) which has its bearings on a second sleeve 393 which, in turn, is supported by bearing on the indicatorv shaft. This second sleeve is supported by a collar362 (Figure 21) secured to the shaft.

The upper end of the sleeve 36|l is secured to the center of a setting lever 363 which has a verposition. The end 351 of the arm 356 is secured to one end of a tension spring 314 which is'secured.

to a downward rbent end of the arm 355.

When the crank -throw isdecreas'ing, the pressure exerted by the contact arm 346 against the edge of the contact plate 350 will swing it on its bearings on the sleeve 334 and will elongate the spring 314. This swinging movement is limited to the elongation of the opening 356 and continued movement will cause the contact arm 346 to break contact with the contact plate 350 at the point 311 (Figure 22) and a'n increased opening at this A shaft 335 is fitted for bearing in the sleeve l lower end of the sleeve 393 which has its bearings point will be produced by the spring 314 acting to swing the contact Iplate on its bearing support in the opposite direction,

Electrical connection to the plate 350 is provided at 319 (Figure 22) The contact arm 341 co-operates with a second contact plate 380 to limit the increase of the crank throw. This ,plate is insulated from its supporting lever 36| by an insulating plate 382 as shown inFigures 21 and 22.

The lever 36| has its bearing support on the sleeve 334 and is provided with a sidewi'se extending arm 384 having an elongated opening 305 through which an end 381 of an arm 368 ex tends. The end 361 is secured to'one end of a comparatively light spring 390 which has its other end secured to a downward extending end of the arm 364.

The upper end of the arm 366 is secured to the on'the indicator shaft, as before noted.

The upper end of the sleeve 393 is secured to the center of a second lsetting lever 395 which has a vertical indicating end 396 extending through. the slot 366. The opposite end of this lever has a manual setting projection 391 (Fig-l ures 3, 4, 21 and 22) which has a collar 396 alsoforced upward by spring of the setting lever to hold the contact plate 350 in its set position in the manner previously described.

The contact plate 385 has means for electrical connection at 353.

The semi-circular edge of the contact plate 380 has a breaking point 400 (Figure 22) which opens when the star wheel has moved to increase the crank throw to the limit determined by the setting lever 335. This breaking point is further opened by action of the spring 330 in the manner previously described.

An indicator arm 40|, Figures 1, 2, 21 and 22, is tted to the upper end of the indicator shaft 34| above the protective case. Its free end swings adjacent to -an index plate 403 secured to the proteotive case and graduated in any suitable manner.

It will be noted that at least one of the contact plates is always in contact. A stop 405 on the setting lever 395, Figures 3, 4, 21 and 22, permits of the same margin for all positions. i

A switch controlling the limit of crank throw of the crank shaft 55a, in both directions, is shown in -Figures 3, 4 and 23.

A vertical bearing sleeve 334a (Figure 4) is fixed -in the clutch case base to provide bearing f for a shaft 335a carrying a lever plate 33141 (Figure 23) which has a pin 33Go operatively making contact with an indicator collar i55a to swing the lever plate and an indicator shaft 34Ia secured thereto. 'Ihese parts are all of the same construction and operation as those previously described. Y

A contact plate 455, Figure 23, has a connecting lug 441 and is secured by an insulating plate 458 to the -swinging lever plate 33f|a to move therewith.

The contact plate 4115 has contact spring arms 453 and 4|5 (Figures 4 and 23) which extend downward.

'Ihe contact arm 453 exerts considerable contact lpressure on a semi-circular contact edge of a contact plate 4|2 carried byan insulating plate 4|3 secured to a swinging lever 4|5 which has its bearings on the sleeve 334a.

The swinging lever is provided with an arm 4 I 5 I extending to one side and provided with an elonjend secured to the arm 4|5 and the other to a pin 42| secured in the clutch case base, acts to increase the break by swinging the contact plate on its bearings to the limit allowed.

The contact arm 4in makes spring pressure contact with a semi-circular contact edge of a second contact plate 423 which serves to limit the decrease of the crank throw.

The contact plate is secured to an insulating plate 424 secured to a swinging lever 425 having bearings on the sleeve 334a and provided with an arm 425 extending sidewise -which is provided with an elongated opening 421 through whichA a pin 423 extends to limit the swinging4 movement of the contact'plate 423. This pinhas its lowerend secured in the clutch case base.

A second pin 425 has its lower end secured like- Wise `and is provided with a spring 430 connected thereto and to the arm 428 to swing the contact plate on its bearings when a break takes place at point 432 of the contact plate 423.

The arms .416 and 426 are bent downward at I (preferably a toggle switch) controls thecircuits including the contact plates' 4|2 and 423 and the coils 235e and 323a. This switch is fixed to the apron with the switch 333 which is of the same construction. They each have an arm 2 (Figure pivoted at 3 to a fixed support 4 and are4 May 2,1944.

by screws 455 to an insulating plate 451,' which is secured to the end of a lever arm 459 by screws 460 (Figure `13). It also has a socket screw 45| which is locked by a nut 462.

A ball extension 453 at the upper end of the tracer bar 455 engages with the socket screw to provide operative movement of the lever arm 459.

The upper end of the tracer bar has a torque rod 451 (Figures'lZ, 13 and 24) secured thereto limited freemovement of the tracer bar 485 inall directions.

The operating plate has a cone shaped depres- Y sion 413 on its upper surface which engages with Aa cone shaped end of an operating pin 414. 'I'his pin is secured in the tracer bar and is of hardened material, as is also the plate. The lower end of the tracer bar has a slotted bore 418 to hold the shanlpgg'f a tracer point 480. A taperedg t 48! locks thxe'tracer vpoint in poand a rough cut section 485 (Figures 2, 13, 24 and 25).

The contact pressure of the operating plate f?y and the pin is provided by a tension spring 483 having one end .secured to a plate 489 fixed to the base support and adjusted by a knurler? nut 484 (Figures 12, -13 and 24) Any side movement of the tracer pointpin any direction, will cause endwise movement of the tracer bar and the lever arm 459 will be moved to make and break the control circuits. Direct pressure on the lower end of the tracer point will also move the lever arm in like manner.

The lever arm 459 has a sidewise extension 496 (Figure 12) which has an electric contact 481 secured to its lower surface.

The contact 481 matches with a like contact on the upper side of the free-end of a .contact spring 490 which is secured at its opposite end to the base support by screws 492. These screws are insulated from the contact spring by insulating washers and by insulating plates 495 and 496 (Figure 13) which also insulate the contact spring from the base support.

A second completely insulated contact spring 499 is also secured by the screws 492 and the insulating plates.

.2 The contact spring 490 is adjusted as to upwad i spring tension by a screw 499 which is secured in bracket and having endv engagement'with the equalizer lever. It is provided with a graduated head 54| and anindicator pin 543 inserted in the bracket.

At a point one-half way between its pivot point t and its contact point, the equalizer lever is provided withl an insulating stop 542;

The stop is solidly secured to the lever by screws 545 and is provided with a central opening 545 (Figure 14) through which the lever arm 459 extends for free vertical movement.

The stop is just wide enough to prevent the lever arm from contacting both Contact spring 490 andjcontact spring 5|0 at the same time.

the insulating plate 496and passes through enlarged holes in both the base support and the con. tact spring 498. The` contact spring 498 is like.

f wise adjustable as to upward tension'by a screw- 500 which passes through an enlarged hole in the base support and carried by the plate 495.

The contact spring 498 is provided with acontact point 502 on its upper side, at its free end,

which matches with acontact carried by a contact plate 504 iixed to the base support but insulated therefrom. v

The lever arm 459 has a second sidewise extension 505 (Figure 12) which has a contact'point 508 on its upper side which matches with a contact on thel lower surface 'of the freev end of a contact spring 5|0. This contact spring is secured to an A contact arm 548, Figures 12 and 13, has a contact pointv 549 which normally' contacts with a like contact on a second spring contact arm These contact arm's are secured to a side extension 552 (Figure 12) of the insulating plate 5| 2 0 by screws 553 which pass through enlarged holes in the contact arm 55| to insulate the arms from each other.

' The free end of the spring contact arm is provided with a downward extending insulating block 555 (Figure 13) secured by ,a screw. When the tracer point isdeflected beyond its normal operating limits, the lever arm 459 will contact the block and breakcontact between the contact arms and open all the circuits controlled by the tracer. The supporting tube 44|'of the tracer has an adapter sleeve 550, Figures 2, 24 and 25, which is secured to the tube by a setscrew 56| which also slides in a vertical slot 563'in a supporting guide 564 to prevent rotation.

The supporting guide is slotted and adjustable by screws 559 to provide a close sliding t for the sleeve.

insulating plate 5|-2 by screws 5|4 which pass through an insulating plate 5|9 (Figure 13) and through enlarged holes in a second contact spring 5|1 to insulate the contact springs from each other and from the basel support.

The insulating plate 5|2 is secured to the side 443 of the base support by screws 5|9 (Figure l2) A screw 522 threaded in the insulating plate 5 I 2 and passing through an enlarged hole in the contact spring 5|1, serves to control the downward spring tension ofthe contact spring 5|0. A like screw 523 controls the tension of the contact spring 5|1.

A The contact spring 5 1 carries a light insulating plate 524 secured toits lower surface to provide operative contact with the contact spring 5| 0. A similar insulating plate 50| is secured to the upper surface of the contact spring 498 to provide operative contact with the contact spring 490. These to the side 443 of the base support by a nut 530 and insulating washers (Figure 12).

At its opposite end, the equalizer lever is at-v tached to one end of a comparatively heavy tension spring 534 which is secured at itsv opposite end to an insulated bracket 535 secured to .the

side 443 'by screws 535 and insulating plates 53.8 (Figure 12).

The equalizer lever is adjusted by a micrometer screw 545 having screw engagement with the The guide is rigidly secured to the outer end of a tracer supportingarm 510 which has slots 512 (Figure l) .through which bolts 513 secure the guide to the cross slide of the lathe.

The tracer is moved vertically to change its guiding contact with the pattern, or to prevent contact with it, by means of the following mechanism:

rIfheadapter sleevel 550 is provided with a horizontal slot 515 (Figure 25) in which the formed edge 511 of a lengthened tracer setting lever 518 s slides. vThis leverhas bearings in projections 519 .and '580 on the upper surface of a switch support 58| which is rigidly secured to the bracket 5| by -screws 583 extending upward through the bracket (Figures 24 and 25).

The tracer setting lever has an angled extension 504 (Figures 24, 25 and 26) which slides in an opening 595 of a shifter arm 581 to operate the lever by movement of the shifter arm.

The shifter arm is fixed to one end of a shifter rod 589 which slides endwise in its bearings 591i (Figures 1 and 2). I

The opposite end of the shifter rod is linked to the end of a manually operated tracer control 592 which is pivoted at 9 to the carriage and is provided with'a vertical operating arm I0.

The pinion53 has a tubular extension 591 (Figures 1, 24 and 25) which extends through the shifter arm for both rotary and a limitedv end' movement. A collar 598 threaded on the extension, limits its end movement. The shifter arm has a downward extending projection 599 which may contact with a cone shaped end 500 of a shifter collar 60| (Figures 1, 25, 26, 27 and 28) which is 'carried by the Splined shaft and whichmay be set in any position by a setscrew 803 (Figure 25).

Wfl

proper operating height.

Four swinging contact arms 604, 6| 0, 632 and 630, Figures 24, 25 and 26, of identical construction, are pivoted at 605 (Figures 25 and 26) to the lower side oi' the switch support.

The contact levers 504 and 6|0 are pivoted to a connecting bar 6I3 to swing in unison during the control movements.

The swinging levers 632 and 638 are likewise'- linked together by a connecting bar 645 to swing in unison.

The connecting bar 6|3 has a sidewlse extendeding sleeve 549 which has its bearings on the outside of the bearing sleeve 620. The sleeve 649 has an arm 650 fixed to its upper end to move in unison with the levers 632 and 538.

The downward extended end o'i.' the swinging lever 804 may contact with the angled end 60'8 of a contact stripI 609 (Figures 1, 24 and 25) which may be riveted to the pattern.

This strip acts to deflect the lever 6M to control the circuits for automatically varying the throw of the crank shaft during cylindrical turning operations, through the longitudinal component, only, ofthe tracer movement.

The lever 6|0 may contact the end of a contact strip 554 when the pattern support has been placed in its reversed position for boring loperations (Figure 26). This will likewise vary the crank throw through the longitudinal component of the tracer movement.

The arm 623 which operates the crank throw controls by the cross feed component of the tracer movement, may contact with the angled end of a contact strip 626 secured to a contact plate 621 with thick washers 629 to bring the strip to its The contact plate is fixed to porting arm by screws 630 (Figures l, 24 and 26).

The end of the lever 632 may contact the angled end of a second contact strip 636 secured t'o the pattern I6 during turning operations to alter the tracer control of the feed mechanism.

The endl of the lever 638 may likewise contact 'the angled end of a contact'strip 642 on the pattern 552 to alter the tracer control during boring operations.

ln both cases,fthe `control is by the longitudinal component of the tracer movement.

The arm 650 may contact the end of a. second contact strip 65| secured by thin washers to the contact plate 621. 'This contact strip acts to alter the tracer control of the feed mechanism by the cross feed component of the tracer movement.

To provide operative contact with the various contact strips, tension, springs SI (Figure 24) having one of their ends secured to the. bars 6 I3 and 645 and their other end secured to pins 6 I6 secured to the switch support, provide the necesvSary pressure.

An automatic snap switch to control the throw of the crankshaft is assembled with an identiasvaaes the switch support. Y operating'mechanism are shown in Figures 1, 24, 25, 26 and 27.

A vertical pin iixed in an insulating base 503 V (Figures i, 26 and 27) provides the bearing vfor one end of a switch arm 688 (Figures 26 and` 27). The switch arm is linked by an insulating rod 656 to the arm 648 to move therewith to alter the tracer movement.

A switch contact arm 668 (Figure 26) is pivoted on a pin fixed in the insulating base to likewise swing sidewise.

The free end of this arm has a contact at its side which may contact with a like contact i'lxed to a. plate B13 which is secured to the insulating base. At its opposite side, the arm has a second Contact point which may contact with a, like point at the end of an adjustable screw 615 in a plate 616 which is also secured to the insulating base.

The outer end of the switch arm 688 has a vertical pin 680 (Figures 25, 26 and 27) to which one end of a tension spring 619 is secured. The

opposite end of the spring is iixed to a verticalpin 617 in the end of the contact arm 668.

'Ihe spring shifts the contact connections of the contact arm when the switch arm 680 has passed the critical point in moving in either direction.

A second switch arm 683 (Figures 25, 26

' and 27) is linked to the outer end of the arm 604 and 6|0 and the arm 623 to vary the crank the tracer supthrow. This switch armis pivoted to its insulating base 681 (Figure 27 in the manner previously described.

A second contact arm 698 is also pivoted to the insulating base (Figure 26) to contact with a contact point on a plate 69| (Figure 27). It may also contact with the end of a contact screw 893 (Figure 27) which is supported by a plate secured to the base.

A vertical pin 695 at the end of the switch arm (Figures 25 and 26) has one end of a tension spring 696 secured thereto and its other' end secured to a like pin 689 (Figure 26) to provide reversal of the contact connections.

An vautomatically operated snap switch to control reversal of longitudinal feed is shown in Figures 25, 26, 27 and 28.

yA downward extending projection '|00 (Figures 25, 27 and 28)/of the switch support, provides bearings for a shaft 102 (Figures 26, 27 and 28) having an integral arm 103 at one end and a switch lever '|05 solidly' secured to the other. 'I'he switch lever may swing to the limits iixed by pins '|01 secured to the switch support, and its lower end may contact with theangled face B00 (Figure 25) of the shifter collar 60| to throw the switch in the reverse direction.

A second shaft 109 (Figures 26, 27 and 28) has like bearings in the projection |00 and carries an arm YH0 to which is secured a contact plate 1| 2 (Figures 27 and 28).by screws 'H3 and insulating washers.

The end of the contact plate has a contact point on one side which may contact with a like point on a contact member 1|8 which is secured to the projection |00 by insulating plates and a screw '|23 (Figures 27 and 28). .At its opposite side, the contact plate carries a second contact point which may contact with a like contact point on a second contact member 128 which is secured to the projection 100 by insulating plates and a screw to insulate it from its support and l from the member 1I8. -A

A sidewise extending pin is secured vto the fre end of the arm 103 to which is secured one end of a tension spring 136 (Figures 26, 2'7 and 28). The other end of the spring is secured to a like pin secured to the end of the arm 1|0. This spring acts to reverse .the contact connections ofthe contact plate when the switch lever has passed its critical point.

A-'pin 138 (Figures 26, 27 and 28) is secured to the extension 599 of the shifter arm to contact with the upper arm of the switch lever 105 to re-set the switch. This is done by manual operation of the shifter control 592.

Mechanism to automatically stop all feeding movements when the spindle rotation stops is shown in Figure 11.

A supporting frame 140 is secured to the lathe headstock 34 by a screw 14| (Figure l). It has two arms 143 and 144 which carry bearings 135 through lwhich a rotatable shaft 146 extends. This shaft has a gear pinion 141 secured to one end which meshes with a gear wheel 148 ro. tatably secured to the lathe spindle (Figure 1).

Theopposite end of the shaft is drilled endwise to receive a'hardened governor pin 150 which is free to slide endwise.

A yoke 152 is secured to the shaft by a pin 154A in position to prevent end motion of the shaft.

Two levers 151 are pivoted by pins 158 to opposite arms of the yoke and have governor weights 159 at their outer ends. Their inner ends 16| are closely fitted between flanges 163 of a governor sleeve 164 which is free to move endwiseon the shaft. This sleeve is provided with a cross-pin 166 which extends through .a slot 161 cut crosswise through the shaft. cross-pin engages with the inner end o f the governor pin for its control movements.

The cross-pin also engages with the end 169 of vthe slot to limit the end movement of the sleeve.

The outer end of the governor pin engages a hardened plate 110 secured to the free end of a contact spring 11|. This spring has a contact point 112 which matches with a like point Y 114 on a contact arm 115.

The contact spring and the contact arm are and by a screw 119.to insulation of the parts.

An adjusting screw 180 is threaded through an insulatingbushing 18| which is inserted in the arm 143 to Vprovide the arm 143. The end of the screw extends of one governor weight, and its other end secured to the end of a screw 186 which is supported by a projection-188 on the opposite governor weight. The tension of this spring is controlled by a knurled nut 189. i

A stop and go switch for the feed mechanism is operated by the tracer shift control 592 and is shown in Figure 1. 1

, A switch lever Il is-hinged at one end 'to aA connecting blade Ai2 which is secured to an insulating block I8 fixed to the lathe can-lage. Thisblock also carries a contact blade |4 which il insulated from the other parte. 4,

- both supported by insulating blocks 116 and 111 i to the rstby a ular construction,

'I'he free end of the switch lever is linked by an insulating connecting rod I5 to` the tracer shift ucontrol 592 to close the switch when the tracer is moved to its operating position.

A transformer 198, Figure operating on an alternating current lighting circuit to deliver current at approximately 18 volts, is secured to the bottom of the clutch case by screws 199.

This transformer is in very common use and.

held closely supported endwise to prevent noise vdue to the rapid reversal of end pressures by-the clutch operating mechanism.

Stil spring washers 8|0 (Figures 1, 3, 4 and 5) are secured by an adjusting nut 8| (Figures l, 3, and 5) to one end of the clutch shaft to automatically maintain end pressures suiliciently high to prevent knocking. [The nuts 8| are locked in place by jam` nuts 8|3.

An alternate form of adjustable throw crank shaft, adapted-to operate two clutch mechanisms, is shown in Figurel 31.

In this form, a crank shaft 820 has acrank head 82|- to which a crank throw member 822 is pivoted by a bearing pin 824. The crank throw/ member provides bearings forja connecting rod 825 which has its free end connected by a bearing bolt 828 to adownward extended end of an arm 621 of an oscillating'sleeve.

justing screw 830 to vary the crank throw.

All these parts are identical with like parts in the regular mechanism and operate in the same manner. f

A second crank throwmember83| isv of the sameconstruction as the member 822, but with-` out the pin 628. It provides bearings for a second connecting rod 833 which is connected in like manner to an arm 858 'f-"of a second oscillating sleeve.

The crank throw member 83| a bearing pin 835 which bears in a crank support 831 vwhich is identical with the eounterbalance support |05 of the regular'construction but somewhat longer to provide greater bearing.

A counterbalancing lever 839, is also of the regand has its bearings on the crank shaft. It has one arm 840- engaging' in a slot 84| in` the crank throw member 83|, while its opposite'arm 843 engages in a slot 944 in the crank is provided -with throw member 822.

This lever `839 provides equal and opposite throw of the crank throw members.

To provide operation of the hook-levers for clutch control with this tric bushing 850 isl secured to` rotate with the 4 crank shaft and to provide bearings for a connecting rod which operates one set of hook. up levers. A second connecting rod 853 is hinged pivot pin 854 to operate a second set of hookj-up levers.

Twoeccentrlc bushings having their crank `thrfmr rotated degrees relative to each other,

modification, an eccenmay be used for independentl` connecting rod operation of the hook-up levers instead of the mechanism here shown. Owing to its better balance, the oppositely moved connecting rods are desirable where high oscillating speeds are used.

An alternate form ofv clutch plate is shown in Figurev 32.

A clutch plate 850 is adapted to be secured in the clutch head in the regular manner as previously described.

The 'contact faces 862 are curved for clutch roller contact and may be formed vto correspond to arcs having their radial points 864 at'one side of the center line 885. A

Operation of the mechanism in turning when using automatic feed shifts The work 31, the tool 4|, and the pattern 46 are placed in position for cylindrical turning as shown in Figure 1.

The tracer shift control 592 is moved to the position shown in Figure 1 to raise the tracer point above the pattern to prevent damage to the ing the contact spring 11| into contact with the position shown for the hook-up lever |88 in Figtracer mechanism' when shifting position. The

carriage and the cross slide are then moved tobring the tracer point to its starting position at r 810 (Figure 1).

The carriage is connected to -the lead screw in the regular manner.

The motor 81 is started. This is preferably operated from an alternating current lighting circuit to drive the crank shafts 80 and 80a. at 2400, R. P. M. and give feeding movements per second, in either direction, for both clutch, members.

In machining this piece, a feeding rate of 2.4 inches per minute of the carriage is desired. The switch 890 is therefore deflected by the operator in the direction indicated by the indicator arm 40|a relative to the index 495, which is visible from the operating position.

This will energize the proper shifter coil, 296:1 or 323a, and the star wheel l10n will be engaged to change the throw of the crank shaft.A When the indicator arm has reached the point correcylindrical portion 811 (Figure 1) of the work. In

this portion, a feeding rate of .3 of an inch is to' be automatically obtained.

While the switch -880 (Figure 30) is still open, as is required for manual adjustment of the throw of the crank shaft 80, the setting levers 363v and 395 are moved to their maximum and minimum setting position, respectively. The crank shaft is then adjusted by manual operation of the switch 498 to give afeeding rate of 2.4 inches per minute, in the manner just described. The v setting lever 395 is then set to the 2.4 inch setting, while the setting lever 858 is set for .3 inch feed per minute, and the switch 99| closed for auto matic control.

The tracershift control 592 is moved to its run-f ning position which closes the switch 'il (Figure 1) and shifts the pinion 59A into mesh with its driving gear Il. It kalso re-sets the switch lever 195 to feed the carriage toward the lathe head and lowers the tracer point into position for rough turning contact with the pattern as shown in The power to rotate the lathe spin dle is thrown in which completes the feeding circuits by bringure 5.

The reciprocating movement of the carrier head, moves the hook-up lever into contact with the arm |95 which is forced from its central, inoperative position to rock the lever |99 on its bearings. This swingsl the yoke ||2 on its pivots IIB, independent of its oscillating movement, and the clutch rollers 9| are forced into driving contact between the clutchplates 93 and the bore of the clutch member 89 to move the cross slide and the tracer in the in-feed direction.

The eccentric bushing |10 is so s et on the crank shaft 80 as to force the clutch .roller contact shortly before the start ofthe connecting rod |53 on its stroke.

Upon completion of one-half of the stroke of the connecting rod, the direction of' movement of the carrier head is 4reversed but the pressure on the clutch rollers is still maintained through action of'the spring 20|.

Upon further movement oi the carrier head, this pressure drops and the positive 'drivingcontact of the clutch rollers is maintained by means of the braking drag 80| which is adjusted to prevent clutch 'over-throw due to the inertia of the clutch mechanism.

Upon reversal of movement oi the connecting rod, the clutch rollers are released from their` drive and return to their central, inoperative position through action of the spring of the leverA |09 and the arm H4; and also of the detent 2|5.V

vhas become stationary until the beginning of the next stroke of the connecting Arod' in the same direction. This is repeated as long as the coil 232 Y is energized, and the 'tracer point will contact at the point 01| (Figure 1) on the pattern,

The tracer point is deiiected by this contact to move the tracer contacts into the position shown in Figure 15. The contact spring 499 is permitted to contact the-plate 504 and the coil 232a is energized..

The-hook-up lever |89a is then permitted to swing to its operative position and the clutch rollers 9|a are forced into driving contact to move the carriage toward the head of the lathe.

The operation of the clutch mechanism controlled by the coil 232a is identical with that controlled by the coil 232 and the carriage will be moved the distance of one one-thousandth of an inch for each revolution of the crank shaft 80a.

It will be noted Vthat carriage and the cross slide are here moving at the same time and at the same feeding rate.

When the cross slide has moved to further deect the tracer point, the connection between the arm 459 and the contact spring 490 is broken and the coil 232 becomes inoperative. The hook-A 

